Difference between revisions of "Template:Ifnotempty"

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imported>Patrick
imported>Amalthea
(unsubst documentation template, and add edge cases to usage)
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<includeonly>{{{{{|safesubst:}}}{{{{{|safesubst:}}}#if:{{{1}}}|p1|p2}}|{{{2}}}|{{{3|}}}}}</includeonly><noinclude><div class="template-documentation" style="margin-top:1em;">{{#if:defaultnotblank|<div style="padding-bottom:3px; border-bottom:1px solid #aaa; margin-bottom:1ex;">
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<includeonly>{{ {{{|safesubst:}}}{{ {{{|safesubst:}}}#if:{{{1}}}|p1|p2}}|{{{2}}}|{{{3|}}}}}</includeonly><noinclude>
<span style="font-size:150%">Documentation</span></div>}}
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{{Documentation subpage}}
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{{Documentation|content=
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With this template [[mw:Help:Extension:ParserFunctions|#if]] can be used in a way such that it does not [[m:Help:Newlines_and_spaces#Stripping_on_expansion|strip spaces and newlines]] from the "then" and "else" part. For evaluating the condition spaces and newlines are stripped like with ParserFunctions.
 
With this template [[mw:Help:Extension:ParserFunctions|#if]] can be used in a way such that it does not [[m:Help:Newlines_and_spaces#Stripping_on_expansion|strip spaces and newlines]] from the "then" and "else" part. For evaluating the condition spaces and newlines are stripped like with ParserFunctions.
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This template can be substituted.
  
 
==Usage==
 
==Usage==
*<code><nowiki>{{ifnotempty|x| p | q }}</nowiki></code> gives "{{ifnotempty|x| p | q }}"
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*<code><nowiki>{{ifnotempty| x | A | B }}</nowiki></code> gives "{{ifnotempty| x | A | B }}"
*<code><nowiki>{{ifnotempty|| p | q }}</nowiki></code> gives "{{ifnotempty|| p | q }}"
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*<code><nowiki>{{ifnotempty|x| A | B }}</nowiki></code> gives "{{ifnotempty|x| A | B }}"
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*<code><nowiki>{{ifnotempty| | A | B }}</nowiki></code> gives "{{ifnotempty| | A | B }}"
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*<code><nowiki>{{ifnotempty|| A | B }}</nowiki></code> gives "{{ifnotempty|| A | B }}"
 
Compare:
 
Compare:
*<code><nowiki>{{#if:x| p | q }}</nowiki></code> gives "{{#if:x| p | q }}"
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*<code><nowiki>{{#if:x| A | B }}</nowiki></code> gives "{{#if:x| A | B }}"
  
 
==Internal technical details==
 
==Internal technical details==
For evaluating the condition (determining non-emptiness of the first parameter) the template uses parser function #if, producing 1 if the condition is true, and 2 otherwise. The template with name equal to "P" followed by the index value produced (hence [[Template:P1]] or [[Template:P2]]), is called with as parameters p and q. This produces either p or q, without trimming.
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For evaluating the condition (determining non-emptiness of the first parameter) the template uses parser function #if, producing 1 if the condition is true, and 2 otherwise. The template with name equal to "P" followed by the index value produced (hence [[Template:P1]] or [[Template:P2]]), is called with as parameters A and B. This produces either A or B, without trimming.
  
 
==See also==
 
==See also==
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[[Category:If-then-else templates]]
 
[[Category:If-then-else templates]]
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}}
 
</noinclude>
 
</noinclude>

Revision as of 13:16, 1 March 2012


50px Template documentation

With this template #if can be used in a way such that it does not strip spaces and newlines from the "then" and "else" part. For evaluating the condition spaces and newlines are stripped like with ParserFunctions.

This template can be substituted.

Usage

  • {{ifnotempty| x | A | B }} gives " A "
  • {{ifnotempty|x| A | B }} gives " A "
  • {{ifnotempty| | A | B }} gives " B "
  • {{ifnotempty|| A | B }} gives " B "

Compare:

  • {{#if:x| A | B }} gives "A"

Internal technical details

For evaluating the condition (determining non-emptiness of the first parameter) the template uses parser function #if, producing 1 if the condition is true, and 2 otherwise. The template with name equal to "P" followed by the index value produced (hence Template:P1 or Template:P2), is called with as parameters A and B. This produces either A or B, without trimming.

See also